Bena thinks that dissolving more salt in water causes the mixture’s freezing temperature to change. Which is the best type of scientific investigation for Bena to use to study this?

Answers

Answer 1

Answer: Entropy and the Second Law of Thermodynamics.
Dissolving salt in water lowers the temperature at which the water freezes, or at which the ice melts.

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A hollow plastic sphere is held below the surface of a fresh-water lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.650 cubic meters and the tension in the cord is 900 N. a) Calculate the buoyant force exerted by the water on the sphere. b) what is the mass of the sphere? c) the cord breaks and the sphere rises to the surface. When the sphere comes to rest, what fraction of its volume will be submerged?
Which of the following is an acceptable description of the frequency of a transverse wave?
In which state of matter are particles packed tightly together and stay in fixed positions?
Maria is camping when she starts to smell smoke. She turns on her radio and hears that a forest fire is heading her way. How can Maria's organ systems interact to help keep her safe? Include at least five organ systems in your response.

One example of a ______________ is the U-turn.

Answers

One example of a turnabout is the U turn

How much work is required to turn an electric dipole 180° in a uniform electric field of magnitude E = 46.0 N/C if the dipole moment has a magnitude of p = 3.02 × 10−25 C·m and the initial angle is 64°?

Answers

Answer:

$W=1.22*10^(-23)J$

Explanation:

Torque and energy of an electric dipole in an electric field we find:

$W=U(\alpha_(o)+\pi )-U(\alpha_(o) )=-pE(cos(\alpha_(o)+\pi )-cos(\alpha_(o) ))\nW=2pECos\alpha_(o)\n W=2(3.02*10^(-25)C.m )(46.oN/C)Cos64\nW=1.22*10^(-23)J$

Final answer:

The work required to turn an electric dipole 180° in a uniform electric field is -4.89 × 10^-24 J.

Explanation:

To calculate the work required to turn an electric dipole 180° in a uniform electric field, we can use the formula:

W = -pE(1 - cosθ)

where W is the work done, p is the dipole moment, E is the electric field strength, and θ is the angle between the dipole moment and the electric field.

Plugging in the given values:

W = - (3.02 × 10-25 C·m)(46.0 N/C)(1 - cos(180° - 64°))

Simplifying the equation gives the work done to be -4.89 × 10-24 J.

Learn more about Work done on an electric dipole here:

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What is a longitudinal wave?a. particles that travel in parallel to the direction of energy movement
b. particles that travel in a reverse direction to the direction of energy movement
c. particles that travel perpendicular to the direction of energy movement
d. particles that travel in an intersecting direction to the direction of energy movement

Answers

The answer is 'A', they travel parallel to the direction of motion

Answer:

Explanation:

i learned this last week in school.

A ball of a mass 0.3 kg is released from rest at a height of 8 m. How fast is it going when it hits the ground? Acceleration due to gravity is g=9.8 m/s^2

Answers

In order to solve this problem, there are two equations that you need to know to solve this problem and pretty much all of kinematics. The first is that d=0.5at^2 (d=vertical distance, a=acceleration due to gravity and t=time). The second is vf-vi=at (vf=final velocity, vi=initial velocity, a=acceleration due to gravity, t=time). So to find the time that the ball traveled, isolate the t-variable from the d=0.5at^2. Isolate the t and the equation now becomes $√((2d)/a)$ . Solving the equation where d=8 and a=9.8 makes the time $√((2*8)/9.8)$ =1.355 seconds. With the second equation, the vi=0 m/s, the vf is unknown, a=9.8 m/s^2 and t=1.355 sec. Substitute all these values into the equation vf-vi=at, this makes it vf-0=9.8(1.355). This means that the vf=13.28 m/s.

Answer:

The answer is 12.5 m/s

v=the square root of 2 x(gh)

or v = the square root of 2 x (9.8 x 8)

Explanation:

State the career function of civil engineering

Answers

Answer:

Civil engineers design major transportation projects. Civil engineers conceive, design, build, supervise, operate, construct and maintain infrastructure projects and systems in the public and private sector, including roads, buildings, airports, tunnels, dams, bridges, and systems for water supply and sewage treatment.

Which structure's primary function is to warm and moisten the air?a. nasal cavity
b. epiglottis
c. bronchus
d. bronchiole

Answers

Answer: a. nasal cavity

Explanation:

The nasal cavity is a external opening of the respiratory tract. This involves two canal like cavities through which air enters the respiratory tract and moves out of the body. These are the two hollow spaces within the nose each of which consists of mucus and lined up with the hairs.

The primary function of the two nasal cavities is to moisturize, warm and filter the air entering the respiratory tract. These cavities filter out environmental contaminants like dust, pollen, molds and others.

A.Nasal cavity!!!!!!!!!!!!!!!!!!!!!!!

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A 0.40-kg cart with charge 4.0 x 10-5 C starts at rest on a horizontal frictionless surface 0.50 m from a fixed object with charge 2.0 x 10-4 C. When the cart is released, it moves away from the fixed object. (a) How fast is the cart moving when very far (infinity) from the fixed charge